I asked the vendor where I bought the RME ADI-2 and he wrote:
[q]Yes, your Mac is the clock master in this case, but the A/D conversion on the ADI2 is better than the A/D conversion in the Mac, so there should still be an improvement. Yes, the ADI2 could sounds better if it were the clock master. There is not a way to do this without adding a USB, Firewire, or PCI slot card that has digital connections that are bi-directional. Your MBox would service this purpose.
[q]Yes to running it through the MBox3, as both the MBox3 clock, and the clock in the ADI2 are superior to the clock in the Mac. As the ADI2 does not have a word clock connection, you need to have a digital cable on the RCA or Optical connection coming from the ADI2 to the MBox3 in order for the MBox3 and thus the Mac be a slave to the ADI2 clock. USB or firewire does not matter in this instance.
Initially I would think that if you have the ADI selected as the master clock in the Mac Audio/MIDI settings, it should be providing the clock, if you can select it as the master clock.
So, would the ADI2 work better for recording by connecting it to the Mbox and choosing the Mbox as my default sound device? Or would any improvements be marginal?
Also, with a TOSLINK connection to the Mac-mini, are these the right settings?
- INPUT LEVEL to Lo Gain
- OUTPUT LEVEL to Hi gain
- set the CLOCK to INP (i.e. the only dot that doesn't have a number of letters beside it)
- INPUT set to OPT